765131 has 2 divisors, whose sum is σ = 765132. Its totient is φ = 765130.

The previous prime is 765109. The next prime is 765137. The reversal of 765131 is 131567.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-765131 is a prime.

It is a super-2 number, since 2×765131² = 1170850894322, which contains 22 as substring.

It is a Chen prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 765097 and 765106.

It is not a weakly prime, because it can be changed into another prime (765137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382565 + 382566.

It is an arithmetic number, because the mean of its divisors is an integer number (382566).

2⁷⁶⁵¹³¹ is an apocalyptic number.

765131 is a deficient number, since it is larger than the sum of its proper divisors (1).

765131 is an equidigital number, since it uses as much as digits as its factorization.

765131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 630, while the sum is 23.

The square root of 765131 is about 874.7176687366. The cubic root of 765131 is about 91.4629629035.

Adding to 765131 its reverse (131567), we get a palindrome (896698).

The spelling of 765131 in words is "seven hundred sixty-five thousand, one hundred thirty-one".